There should be more cockpit items that are animated in accordance with control inputs.
- Joysticks and driving wheels that can be set to respond to pitch/yaw/roll inputs
- Similarly, pedals
- Levers and sliders
- Buttons
Also, more gauges and indicators:
- More customization of gauges, such as adding text and numbers
- Analog-looking artificial horizon/gyroscope
- Spirit levels (those narrow glass cylinders filled with water save for a bubble of air, made for checking orientation)